JavaScript is disabled for your browser. Some features of this site may not work without it.
Serum and plasma metabolites and insemination timing associated with greater pregnancy risk in suckled beef cows subjected to artificial insemination programs
Hill, Scott L.
Four experiments were conducted in beef cows to determine factors that increased the probability of pregnancy per AI when cows are inseminated by appointment. Cows in all experiments were inseminated after a 7-d CO-Synch + CIDR program (100 μg GnRH [2 mL Factrel, Pfizer Animal Health, Whitehouse Station, NJ] 7 d before 25 mg PGF2α [d 0; 5 mL L Pfizer Animal Health]). Experiment 1 compared 1 vs. 2 inseminations and GnRH injection times at 60 and 75 h after the CO-Synch + CIDR program. Delaying AI until 75 h, according to interpretation of estrus-detection patches, for cows not in estrus by 60 h after CIDR insert removal increased (P & 0.05) pregnancy risk (PR) compared with cows not in estrus and inseminated at 60 h (51.4 vs. 41.7%), respectively. The necessity of GnRH injection concurrent with AI was tested in experiment 2. Cows displaying estrus by 65 h that were injected with GnRH had similar PR to cows in estrus and not treated with GnRH (61.9 vs. 60.4%), respectively. Cows in experiment 2 that did not display estrus, but were treated with a GnRH injection at 65 h and then inseminated at 84 h after CIDR insert removal had increased PR compared with similar cows not treated with GnRH (33.4 vs. 15.0%; P & 0.01), respectively. Experiments 3 and 4 were observational studies conducted to determine if blood metabolites glucose and beta-hydroxy butyrate (BHB experiment 3), or physical body and blood metabolites, (glucose, BHB, non-esterified fatty acids [NEFA], blood urea nitrogen [BUN], body weight, rump fat [RF], or BCS; experiment 4) were indicative of future reproductive success in suckled beef cows enrolled in a timed AI program. In experiment 3, plasma glucose concentration 10 d before AI was lesser (P = 0.01; 52.2 vs. 56.9 mg/dL) and serum BHB concentration was lesser (P & 0.01) in cows that became pregnant 35 d after timed AI than for cows that did not become pregnant (600 vs. 690 μM), respectively. Experiment 4 identified relationships between indicators and reproductive success including the finding that serum NEFA concentration 2 to 4 wk before AI is negatively correlated (P & 0.05) with PR to AI.
Keywords: Timed art Art Beef c Preg GnRH Insemination timing beef cows
Graduation Month:
Doctor of Philosophy
Department:
Department of Animal Sciences and Industry
Major Professor:
Jeffrey S. Stevenson
Dissertation
Record URL:
Files in this item
ScottHill2016.pdf
Showing items related by title, author, creator and subject.
The objective was to quantify the reinsemination intervals of lactating dairy cows that were
either inseminated at estrus or received a timed AI (TAI) at first service. Cows in Experiment
1 were enrolled in a TAI program ...
A controlled field study examined conception
rates after two timed-AI (TAI) breeding
protocols conducted on two commercial dairy
farms. Estrous cycles in postpartum lactating
cows were presynchronized with two ...
KSU breeding records show a higher farrowing rate for gilts that "lock" on the insemination spirette at both inseminations as opposed to gilts that "lock" at
one insemination or at neither insemination. Continued research ...
Center for the
Advancement of Digital
Scholarship
118 Hale Library
Manhattan KS 66506
(785) 532-7444DESY Library (-L-)Request for publication of the scientific paper PUBDB-
pubdb entry:PUBDB-Corresponding Author:E-mail:library@desy.deAuthor(s):Brinkmann, A.* ; Ziegler, J.*Title:Dry-Ice Cleaning of RF-Structures at DESYRead and recommended for publication by scientist:To be published in journal/proceedings/book: (2016)
/ , LINAC 16, Meeting locationEast Landing, MI, Deutsches Elektronen-Synchrotron DESY, USA, 25 Sep 2016 - 30 Sep 2016To be stored in the electronic arXiv category at least under CC-BY licence2):_________________________Approved* as a red DESY report and accepted for transfer to an E-print archive____________________________________________________________ ____________________________________________________________
Approved singatory/date
Name in printInternal remarksApproved* for publication in the journal stated above:&____________________________________________________________ ____________________________________________________________
Member of DESY directorate/date
Checked by -L-*Only in case of refusal a copy of this form is sent back to the corresponding author aboveAll authors agree to publish the fulltext of the paper via DESY publication database if this is permitted by the publishers."The fourndation Deutsches Elektronen-Synchrotron shall be entitled to make the artcile freely accessible to the general public on the internet or in some other form at the time of publication (alternatively 3 or 6 months after the article's publication)All papers have to be submitted to an e-print archive after having been approved as a red report. Online help for submission is available at http://de.arxiv.org/help/submit. In case of problems contact